• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a sealing device (100, 100 '), a hydraulic piston (101), a length-adjustable connecting rod (103) and a manufacturing method for producing such a sealing device (100, 100'). A first annular sealing device (1) with a first gap (1 ') and a second annular sealing device (2) with a second gap (2') are seated radially in a manner on a third sealing device (3) with a third gap (3 '). ) that the first seal means (1) and the second seal means (2) are juxtaposed in an axial direction and the first gap (1 '), the second gap (2') and the third gap (3 ') in a circumferential direction each shifted from each other.
    公开号:AT519652A4
    申请号:T50288/2017
    申请日:2017-04-07
    公开日:2018-09-15
    发明作者:Pichler Jürgen；Ing Andreas Krobath Dipl；Ing Norbert Ausserhofer Dipl；Greylinger Wilhelm；Dipl Ing Fürhapter Heinrich
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    Sealing device and hydraulic piston with sealing device
    The invention relates to a sealing device for sealing hydraulic chambers of a length-adjustable connecting rod, in particular an internal combustion engine, a hydraulic piston with such a sealing device, a length-adjustable connecting rod with such a hydraulic piston and a manufacturing method for producing such a sealing device.
    In order to influence the power transmission from a reciprocating piston to a crankshaft in an internal combustion engine, length-adjustable connecting rods are known from the prior art. Through this it is possible to change a compression ratio of the internal combustion engine and in particular to adapt to work steps of a working cycle of the internal combustion engine and / or to driving situations of a vehicle, which is equipped with a corresponding internal combustion engine. For example, it may be desirable to operate the internal combustion engine at full load with a low compression ratio and at partial load or during startup with an increased compression ratio, such that peak pressures can be reduced under full load, fuel economy reduced at part load, or compression pressure increased at startup.
    In some length-adjustable connecting rods hydraulic systems are provided for adjusting the connecting rod length, by means of which movably mounted parts of the connecting rod can be moved and / or fixed in a desired position. For this purpose, a hydraulic medium in hydraulic chambers, which are generally formed by a hydraulic piston in a hydraulic cylinder, acted upon by a predetermined pressure.
    It is an object of the invention to improve a hydraulic adjustment of a length of a length-adjustable connecting rod, in particular to increase the reliability of setting.
    This object is achieved by a sealing device, a hydraulic piston, a length-adjustable connecting rod and a manufacturing method for such
    Sealing device according to the independent claims. Advantageous embodiments are the subject of the dependent claims.
    A first aspect of the invention relates to a sealing device for sealing hydraulic chambers of a length-adjustable connecting rod, in particular an internal combustion engine, wherein the sealing device comprises a first annular sealing device with a first gap, a second annular sealing device with a second gap and a third annular sealing device with a third gap , Preferably, the first and second sealing means are seated radially on the third sealing means in such a manner that the first sealing means and the second sealing means are arranged side by side in an axial direction. In this case, the first gap, the second gap and the third gap are preferably displaced relative to each other in a circumferential direction.
    A second aspect of the invention relates to a hydraulic piston, in particular a replaceable piston, with at least one sealing device according to the first aspect of the invention.
    A third aspect of the invention relates to a length-adjustable connecting rod for use in a variable compression ratio internal combustion engine comprising a hydraulic cylinder and a hydraulic piston according to the second aspect of the invention.
    A fourth aspect of the invention relates to a manufacturing method for a sealing device according to the first aspect of the invention. In this case, the first and second sealing device is placed on the third sealing device in such a way that the first sealing device is arranged axially adjacent to the second sealing device. Preferably, both an upper side of the first sealing device together with an upper side of the third sealing device and a lower side of the second sealing device are ground flat together with a lower side of the third sealing device.
    The features and advantages described below in relation to the first aspect of the invention and its advantageous embodiment apply, where technically reasonable, also for the second, third and fourth aspects of the invention and its advantageous embodiment and vice versa.
    For the purposes of the invention, an annular sealing device with a slot is to be understood as meaning a sealing ring which has a slot-like gap along its circumference, ie. is interrupted at one point. In particular, an annular sealing device with a slot is topologically a cylinder or cuboid bent along a circle.
    For the purposes of the invention, a hydraulic chamber is to be understood as a preferably sealed space which can be charged with a hydraulic medium, in particular an oil. In this case, a hydraulic chamber is preferably formed by at least two relatively movably mounted elements, such as a hydraulic cylinder, in which a hydraulic piston is or is introduced. The hydraulic medium is preferably acted upon by a pressure, whereby the two elements can be moved relative to each other.
    For the purposes of the invention, radial or radial direction, axial or axial direction or circumferential direction are respectively directions along a radius of the circular sealing device or sealing device (s), along a perpendicular to a radius of the circular sealing device or sealing devices) or along the circumference Sealing device or sealing devices) to understand.
    In the context of the invention, a retaining lug means a locking means, in particular a projection for blocking a rotary movement, with which preferably a rotation of the first, second and / or third sealing device in the circumferential direction can be prevented from one another. Preferably, a retaining lug is designed or set up to support the first, second or third sealing device against each other.
    The invention is based in particular on the approach that, with a staggered arrangement of slotted, annular sealing devices in the region of a hydraulic chamber of a length-adjustable connecting rod, a leakage of a hydraulic medium, in particular a creep of hydraulic medium, from that of a
    Hydraulic cylinder and a hydraulic piston of the length-adjustable connecting rod formed hydraulic chamber out avoiding or at least reducible.
    A staggered arrangement according to the invention relates on the one hand the spatial arrangement of the sealing means and on the other hand, the alignment of the slots of the sealing means in a circumferential direction of the sealing means relative to each other. In particular, the slots of the sealing devices in this arrangement are each arranged at different positions along the circumference of the sealing devices.
    The staggered arrangement preferably extends along two spatial dimensions, in particular along an axial direction and a radial direction. Preferably, in each case two sealing devices are arranged axially or radially next to each other and thereby displaced or rotated in such a way along their circumferential direction that their slots are arranged spatially separated from each other in the circumferential direction.
    As a result, leakage of hydraulic medium through a slot of a sealing device is prevented or at least reduced by two adjacently arranged further sealing devices. In particular, the first slot of the first sealing means is sealed in the axial direction by the second sealing means and in the radial direction by the third sealing means, i. covered. Accordingly, the second slot of the second sealing means is sealed in the axial direction by the first sealing means and in the radial direction by the third sealing means, i. covered. Also, the third gap is sealed in the radial direction by the first and second sealing means, i. covered.
    Overall, the invention allows hydraulic medium in a hydraulic chamber of a length-adjustable connecting rod can be reliably acted upon by a predetermined pressure.
    In an advantageous embodiment, the sealing device has a securing element, which is adapted to fix the sealing means in the circumferential direction relative to each other. This reliably prevents the first, second and third gaps of the first, second and third sealing devices from being axially or axially displaced by a rotation of the first, second and / or third sealing device. Radial direction next to each other come. Thus, hydraulic medium can not pass from the first into the second and / or third gap or vice versa and / or from the second into the third gap or vice versa and thus compromise the sealing effect of the sealing device.
    In a further advantageous embodiment, the securing element has a first retaining lug arranged on the first sealing device and a second retaining lug arranged on the second sealing device. Preferably, the first and second retaining lugs are each adapted to engage in the third gap. Preferably, the first or second retaining lug is designed such that it protrudes in the radial direction from the first and second sealing device. Preferably, the first and second retaining lug projects radially inward.
    The first and second retaining lugs are preferably embossed in the first and second sealing device. Preferably, the first and second retaining lugs are shaped in such a way that they form a, in particular hollow, hemisphere when engaging in the third gap.
    As a result, the securing element can be made easily, in particular in one piece with or out of the first or second sealing device, and permits reliable fixing, in particular anti-rotation, of the first, second and / or third sealing device relative to one another.
    In a further advantageous embodiment, the first sealing device has a first groove and the second sealing device has a second groove. Preferably, the securing element is arranged to parts in the first groove, the second groove and the third gap or a bore of the third sealing device. Thereby, the securing element can be easily integrated into the sealing device and allow a reliable fixation of the first, second and / or third sealing means relative to each other.
    In a further advantageous embodiment, the securing element has a securing pin. Preferably, the locking pin is arranged and / or arranged to pass through the third gap or the bore and engage in the first and second groove. Preferably, the locking pin is also set up or designed such that it can be inserted into a locking pin bore of a hydraulic piston. In this case, the locking pin can be pressed into the bore and / or the first and second groove. As a result, the first, second and third securing devices can be secured against rotation relative to one another and / or relative to a hydraulic piston simply and reliably.
    In a further advantageous embodiment, the securing element has a safety ball, which rests in the third gap and in the first and second groove. Preferably, the first and second groove are formed such that they form a hemispherical recess for receiving the safety ball when receiving the backup copy. Thereby, the sealing device with the securing element can be easily mounted.
    In a further advantageous embodiment, the total axial height of the first and second sealing means in a seated state on the third sealing means corresponds at least substantially to the axial height of the third sealing means. In other words, an upper side of the first sealing device is preferably aligned with an upper side of the third sealing device in a radial plane. Correspondingly, a lower side of the second sealing device is preferably flush with a lower side of the third sealing device opposite the upper side of the third sealing device in a radial plane. As a result, the sealing device can be accurately inserted and fixed in a groove, but at least the axial play in the groove can be reduced.
    Under a top or bottom of a sealing device in the context of the invention is in each case a substantially perpendicular to the axial direction surface, in particular end face to understand the sealing device. A surface normal of the upper side is aligned opposite to a surface normal of the lower side, i. The top and bottom of a sealing device are opposite. Alternatively, instead of the top and bottom, it is also possible to speak of a first or second end face.
    In a further advantageous embodiment, the overall axial height of the first and second sealing means and the axial height of the third sealing means is between 0.75 mm and 5 mm, preferably between 1 mm and 2 mm, in particular between 1.25 mm and 1.75 mm. Such dimensioned sealing devices allow on the one hand a space-saving use in a length-adjustable connecting rod, but on the other hand have sufficient axial extent to achieve a reliable seal of a hydraulic chamber in this connecting rod.
    In a further advantageous embodiment, an outer diameter of the first and second sealing device is in each case between 15 mm and 25 mm, preferably between 17.5 mm and 22.5 mm, in particular between 19 mm and 21 mm. Preferably, the outer diameter of the first and second sealing device corresponds in each case at least substantially to a diameter of a lateral surface of a hydraulic piston of a length-adjustable connecting rod, wherein the sealing device can be mounted on the hydraulic piston or is.
    Such dimensioned sealing devices allow on the one hand a space-saving use in a length-adjustable connecting rod, but on the other hand have sufficient radial extent to allow the reliable sealing of a gap between a hydraulic piston with a large effective area and a hydraulic cylinder.
    In a further advantageous embodiment, an inner diameter of the first and second sealing means on the one hand and an outer diameter of the third sealing means on the other hand each between 14 mm and 24 mm, preferably between 16 mm and 22 mm, in particular between 18 mm and 20 mm. Preferably, the inner diameter of the first and second sealing means on the one hand and the outer diameter of the third sealing means on the other hand selected such that the first and second sealing means on the third sealing means fixed, in particular rotationally and sealingly, preferably with a predetermined pressure, sit or can sit.
    Such dimensioned sealing means allow on the one hand a space-saving use in a length-adjustable connecting rod, but on the other hand, however, have a sufficient radial extent in order to be able to be mounted on a mechanically stable hydraulic piston with a large effective surface.
    In a further advantageous embodiment, an inner diameter of the third sealing device is between 13 mm and 23 mm, preferably between 15 mm and 21 mm, in particular between 17 mm and 19 mm. In this case, the inner diameter of the third sealing device preferably defines the inner diameter of the sealing device. Preferably, the inner diameter of the third sealing means is selected such that the sealing device on a lateral surface of a hydraulic piston of a length-adjustable connecting rod fixed, in particular rotationally fixed and sealing, preferably with a predetermined pressure, seated or can sit.
    Such dimensioned sealing means allow on the one hand a space-saving use in a length-adjustable connecting rod, but on the other hand, however, have a sufficient radial extent in order to be able to be mounted on a mechanically stable hydraulic piston with a large effective surface.
    In a further advantageous embodiment, the first, second and third sealing means are each made of spring steel. As a result, the sealing devices or the sealing device are resistant to abrasion and allow a long-lasting, reliable sealing of a hydraulic chamber in a length-adjustable connecting rod.
    In a further advantageous embodiment, the first and the second gap are displaced in the circumferential direction by substantially 180 degrees to each other. Thereby, the first gap in the axial direction can reliably be reliably sealed by the second sealing means and the second gap in the axial direction can be reliably sealed by the first sealing means, i. be covered. Preferably, the first and second sealing means, such as when they are placed on a hydraulic piston or are, in particular in a groove of the hydraulic piston are or are, pressed against each other with a predetermined pressure in the axial direction. The orientation of the first gap in a radial direction, which is substantially opposite to a radial alignment direction of the second gap, allows the first and second sealing device in this case a mechanically stable bearing surface in the region of the first and second gap.
    Preferably, the third gap in the circumferential direction relative to the first and second gap in each case by substantially 90 degrees. Thereby, the first and second gaps in the radial direction are reliably sealed by the third sealing means, i. covered.
    In a further advantageous embodiment, a gap width of the first, second and third gap in the seated state of the first and second sealing means on the third sealing means is less than 75 pm, preferably less than 50 pm, in particular less than 10 pm. Preferably, the inner or. Outer diameter of the first, second and third sealing means selected or matched to one another such that the aforementioned gap widths can be realized or undershot. By designing the sealing devices with such small gap widths, the leakage of hydraulic medium through one of the gaps of the sealing devices from a hydraulic chamber in a length-adjustable connecting rod can be avoided or at least reduced and thus enables a particularly reliable sealing of the corresponding hydraulic chamber.
    In a further advantageous embodiment, a first sealing device in a region of a first end face of the hydraulic piston and a second sealing device in a region of the first end face opposite, second end face of the hydraulic piston is arranged. This arrangement of first and second sealing device is particularly advantageous when the hydraulic piston is designed as a replaceable piston, i. with the first end face forms a first hydraulic chamber and the second end face a second hydraulic chamber or closes, so that each of the end faces acted upon by a pressure and formed as a replaceable piston hydraulic piston can thereby be moved axially. Each of the sealing device is configured to seal one of the two hydraulic chambers against leakage of hydraulic medium.
    In a further advantageous embodiment, the hydraulic piston on a lateral surface, which is axially bounded by the first end face and the second end face, wherein the lateral surface in the region of the first end face a first, the lateral surface circumferential groove for receiving the first sealing device and in the region of the second End face a second, the lateral surface circumferential groove for receiving the second sealing device. In particular, the first and second end faces are connected to one another via the jacket surface of the preferably cylindrically shaped hydraulic piston.
    Preferably, the first and second groove are formed such that the first and second sealing device can be accommodated in each case accurately. In particular, the first and second groove are formed such that a lateral surface of the first and second sealing device terminates almost flush with the lateral surface of the hydraulic cylinder and only by between 100 pm and 1 pm, preferably between 75 pm and 10 pm, in particular between 50 and 20 pm protrude from the groove.
    As a result, the first and second sealing device can be fixed and arranged to save space on the hydraulic piston even with movement of the hydraulic piston on the one hand, and on the other hand a reliable seal against leakage of hydraulic fluid from one adjacent to the first and second end faces of the hydraulic piston hydraulic chamber can be achieved.
    In a further advantageous embodiment, the first groove and the second groove are each formed in such a way that the respectively arranged therein sealing devices in the radial direction have a game, which in particular allow compensation for the expansion of the sealing devices in their heating and / or cover manufacturing tolerances and so that an optimal sealing effect of the sealing devices can afford. Thus, in particular, it is possible to prevent hydraulic medium in contact with the sealing device between the first or second sealing device and a hydraulic cylinder in which the hydraulic piston with the two sealing devices is inserted between the first or second sealing device and the third sealing device or between the third sealing device and the hydraulic piston or a groove bottom creeps. At the same time, the play of the sealing devices is large enough to absorb temperature-induced changes in the diameter of the sealing devices, so that the sealing devices reliably seal the hydraulic chambers closed by the hydraulic piston even with heavy heating during operation of the hydraulic piston.
    In a further advantageous embodiment, the hydraulic piston has an axially arranged blind hole, wherein the hydraulic piston can be connected by means of the blind hole with a shaft, in particular a length-adjustable connecting rod. For this purpose, the blind hole preferably has a thread, in particular an internal thread, which interacts or may interact with a thread, in particular external thread, of the shaft. Thereby, the hydraulic piston can be easily and reliably connected by screwing with the shaft, which on the one hand enables a safe transmission of the hydraulic piston movement on the shaft and on the other hand an efficient production of length-adjustable connecting rods with such hydraulic cylinders.
    In a further advantageous embodiment, the hydraulic piston has at least one fastening recess, which is arranged on the lateral surface of the hydraulic piston and is adapted or adapted to interact with a tool for connecting the hydraulic piston to the shaft. The at least one fastening recess preferably surrounds the lateral surface of the hydraulic piston. In this case, the fastening recess can be arranged axially between the first sealing device and the second sealing device. Preferably, the mounting recess is formed or shaped as a hexagon screw or counterpart of an (external) hexagonal wrench, so that the hydraulic piston can be easily and reliably screwed onto the shaft by means of the hexagonal wrench.
    In a further advantageous embodiment, the length-adjustable connecting rod has a shaft with which the hydraulic piston can be connected, in particular screwed, is. About the shaft is a small connecting rod of the length-adjustable connecting rod with the hydraulic piston in operative connection, so that a hydraulically caused movement of the hydraulic piston in the axial direction has such a movement of the small connecting rod result.
    In a further advantageous embodiment, the connecting rod has an anti-rotation device which is adapted to fix the shaft in a circumferential direction relative to the hydraulic cylinder. As a result, a predetermined orientation of the small connecting rod end connected to the shaft can also be ensured during operation of the length-adjustable connecting rod and by periodic movements of the connecting rod
    Shaft and / or the hydraulic piston along the circumferential direction in the hydraulic cylinder generated vibrations avoided or at least reduced.
    In a further advantageous embodiment, the anti-rotation device in the hydraulic cylinder in the axial direction movable, connected to the shaft sleeve member and a radially projecting into the hydraulic cylinder pin member, wherein the pin member engages in a arranged on a shell side of the sleeve member in the axial direction guide groove of the sleeve member. Thereby, the pin member can reliably prevent rotation of the sleeve member and thus the shaft and the hydraulic piston and the small connecting rod along the circumferential direction.
    Other features, advantages and applications of the invention will become apparent from the following description of exemplary embodiments in conjunction with the figures, in which the same reference numerals for the same or corresponding elements of the invention are used throughout. At least partially schematically show:
    Fig. 1 shows a first preferred embodiment of a sealing device;
    Fig. 2 shows a second preferred embodiment of a sealing device;
    3 shows a third preferred embodiment of a sealing device;
    4 shows a fourth preferred embodiment of a sealing device;
    5 shows a preferred embodiment of a length-adjustable connecting rod; and
    Fig. 6 shows a preferred embodiment of a hydraulic cylinder.
    1 shows a first preferred embodiment of a sealing device 100 according to the invention is shown, which has three annularly formed sealing means 1-3.
    The first sealing device 1, which has a first gap 1 ', and the second sealing device 2, which has a second gap 2', are preferably concentric with the third sealing device 3, which has a third
    Gap 3 'has arranged. In this case, the first sealing device 1 and the second sealing device 2 are preferably axially adjacent to each other, i. in the illustration shown above or below each other, arranged and embrace the third sealing device third
    In other words, the first and second sealing devices 1, 2 preferably rest on the third sealing device 3, wherein an outer diameter of the third sealing device 3 essentially corresponds to an inner diameter of the first and second sealing device 1, 2.
    In this case, an upper side o1 of the first sealing device 1 preferably terminates flush with an upper side o3 of the third sealing device 3. Analogously, a lower side 2u of the second sealing device 2 preferably terminates flush with a lower side 3u of the third sealing device 3.
    Such a step-free upper and lower side of the sealing device 100 can be produced, for example, by arranging the sealing devices 1-3 in the manner shown and then planar grinding the top or bottom side of the sealing device 100.
    By the arrangement of first, second and third sealing means 1,2, 3 shown in Figure 1, the first gap 1 'of the first sealing means 1 is preferably sealed in the axial direction by the arranged below the first sealing means 1 second sealing means 2 in the axial direction, i. covered. The spreading, in particular creeping, of hydraulic medium from a hydraulic chamber (not shown), which is located above the sealing device 100, into a region below the sealing device 100 can therefore be avoided or at least reduced in the region of the first gap 1 ', at least by means of the second sealing device 2 become.
    The same applies to the second gap 2 'of the second sealing device 2 in the opposite direction.
    The arrangement of first, second and third sealing means 1, 2, 3 shown in Figure 1 preferably also prevents or reduces the spread of hydraulic medium on an inside of the sealing device 100. Hydraulic medium from a hydraulic chamber (not shown) above the sealing device 100 may be in a Area of the first gap V do not propagate radially inward, since the third sealing means 3, the first gap V of the first sealing means 1 preferably seals in the radial direction, ie covers.
    The same applies to the second gap 2 'of the second sealing device. 2
    FIG. 2 shows a second preferred exemplary embodiment of a sealing device 100 with first, second and third sealing devices 1, 2, 3 and a securing element 16, wherein the angle of view of the sealing device 100 in FIGS. 2A and 2B is rotated by 180 °.
    As clearly visible in FIG. 2A, the securing element 16 has a first retaining lug 16a and a second retaining lug 16b, which are arranged next to one another or one above the other in the axial direction. Preferably, the first retaining lug 16a is formed integrally with the first sealing device 1 and the second retaining lug 16b is integrally formed with the second sealing device 2. Preferably, the first and second retaining lug 16a, 16b respectively in the manner, in particular shell-shaped, formed or shaped so that they form a, in particular hollow, hemisphere in mutual contact, as shown in Figure 2B is clearly visible.
    The retaining lugs 16a, 16b preferably extend radially inwards from the first and second sealing devices 1, 2, respectively. In the mounted state of the sealing device 100, the retaining lugs 16a, 16b engage preferably in the third gap 3 'of the third sealing device 3 and thus prevent rotation of the first, second and / or third sealing device 1,2, 3 against each other.
    3 shows a third preferred embodiment of a sealing device 100 with a first, second and third sealing means 1,2, 3 and a securing element 16 is shown. Figure 3A shows a perspective view of the sealing device 100 and Figure 3B shows an arrangement of the sealing device 100 in or on a hydraulic piston 101, in particular a length-adjustable connecting rod.
    The securing element 16 has a securing pin 16 c which partially into a first groove 17 a of the first sealing device 1 and partially into a second
    Groove 17b of the second sealing device 2 is pressed. Preferably, a radially outer end of the securing pin 16c terminates substantially flush with a radially outer circumferential surface of the first or second sealing device 1, 2.
    The securing pin 16c preferably extends radially inward from the first or second sealing device 1, 2 and thereby passes through a third gap 3 'of the third sealing device 3. As a result, the securing pin 16c can be mounted in a first groove 6 of the hydraulic piston 101 when the sealing device 100 is mounted inserted into a locking pin bore 18, in particular press-fitted, are. The securing pin bore 18 is preferably arranged in the first groove 6, so that the locking pin 16 c introduced into the securing pin bore 18, the first, second and / or third sealing means 1, 2, 3 against rotation in the circumferential direction, in particular against rotation relative to the hydraulic piston 101, secures.
    In an alternative embodiment, not shown, the locking pin 16c may also engage or be pressed into a corresponding bore in the third sealing device 3 instead of the third gap 3 '. As a result, a particularly secure fit of the securing pin 16c in the third sealing device 3 is made possible.
    FIG. 4 shows a fourth preferred embodiment of a sealing device 100 with a first, second and third sealing device 1, 2, 3 and a securing element 16. FIG. 4A is a perspective illustration and FIG. 4B is an arrangement of the sealing device 100 in or on a hydraulic piston 101, in particular a length-adjustable connecting rod shown.
    The securing element 16 has a securing ball 16d, which is arranged partially in a first groove 17a of the first sealing device 1 and partially in a second groove 17b of the second sealing device 2. Preferably, the safety ball 16d is also partially arranged in a third gap 3 'of the third sealing device 3. Preferably, the third sealing device 3 in the region of the third gap 3 ', a third groove (not shown), which at least partially receives the safety ball 16d.
    Preferably, the first and second grooves 17a, 17b are formed in such a manner that the securing ball 16d in the mounted state of the sealing device 100, in particular in a groove 6 of the hydraulic piston 101, radially outwardly supported by the first and second groove 17a, 17b becomes. Alternatively, the safety ball 16d may also be radially outwardly supported by a hydraulic cylinder (not shown) in which the hydraulic piston 101 is slidably mounted. Radially inside, the securing group 16d can be supported by the third groove or the bottom of the groove 6.
    FIG. 5 shows a preferred exemplary embodiment of a hydraulic piston 101 which has two sealing devices 100, 100 'arranged in the region of its end faces 4, 4'.
    The hydraulic piston 101 is arranged in a hydraulic cylinder 102 of a length-adjustable connecting rod 103 shown only in sections, in which it is displaceably mounted in the axial direction, as indicated by the double-headed arrow. The hydraulic piston 101 and the hydraulic cylinder 102 preferably form a first hydraulic chamber 5, which can be charged with a hydraulic medium, in particular oil. The hydraulic medium can preferably be subjected to a predetermined pressure. The thereby acting on a first end face 4 of the hydraulic piston 101 pressure may preferably cause a movement of the hydraulic piston 101 in the axial direction, so that the first hydraulic chamber 5 and its volume increases. Alternatively, a feed can also be effected by inertia and / or acceleration forces on the hydraulic piston 101. In this case, filled oil prevents movement of the hydraulic piston 101 in the opposite direction.
    The hydraulic medium in the first hydraulic chamber 5 is acted upon in particular by the predetermined pressure, since a first sealing device 100 leakage of the hydraulic medium from the first hydraulic chamber 5 in a gap, in particular gap between the hydraulic piston 101 and the hydraulic cylinder 102 and / or in a Space in the region of the second end face 4 'of the hydraulic piston 101, in particular in a second hydraulic chamber (not shown), prevented or at least reduced.
    Also, the hydraulic medium in this second hydraulic chamber, which is also formed by the hydraulic piston 101 and the hydraulic cylinder 102, may preferably be pressurized, since a second sealing device 100 ', the leakage of the hydraulic medium in the intermediate space, in particular gap, between the hydraulic piston 101st and the hydraulic cylinder 102 and / or in the first hydraulic chamber 5 is prevented or at least reduced.
    When the hydraulic piston 101 moves down, i. If the volume of the first hydraulic chamber 5 decreases, the volume of the second hydraulic chamber arranged in the region of the second end face 4 'of the hydraulic piston 101 increases and vice versa.
    The hydraulic piston 101 has for receiving the first and second sealing device 100, 100 'in the region of its two end faces 4, 4', preferably each a circumferential surface of the hydraulic piston 101 surrounding first and second groove 6, 6 '. The grooves 6, 6 'are preferably formed or shaped in such a way that the sealing devices 100, 100' can be received substantially accurately. In particular, a depth of the grooves 6, 6 'substantially corresponds to the axial cross section of a segment of the annular sealing devices 100, 100'.
    The sealing devices 100, 100 'preferably project at least partially out of the grooves 6, 6' in the radial direction, in particular between 100 μm and 1 μm, preferably between 75 μm and 10 μm, particularly preferably between 50 μm and 20 μm. In this case, the sealing devices 100, 100 'arranged in the grooves 6, 6' and partly protruding from them are in particular configured to act as guide elements of the hydraulic piston 101 in the hydraulic cylinder 102. This advantageously prevents the hydraulic piston 101, in particular during a movement of the hydraulic piston 101, from interacting with the hydraulic cylinder 102, which on the one hand increases the service life of the hydraulic piston 101 or cylinder 102 and, on the other hand, increases a frictional resistance which occurs during the movement of the hydraulic piston 101 is overcome, at least reduced.
    The hydraulic piston 101 has in the axial direction, in particular along an axis of symmetry of the cylindrically shaped hydraulic piston 101, preferably a blind hole 7 into which an internal thread can be cut. The blind hole 7 is preferably configured to receive a shaft 8 of the length-adjustable connecting rod 103 or to connect the shaft to the hydraulic cylinder 101, in particular in a form-locking and / or non-positive manner. For this purpose, the shaft 8 may have an external thread, which may interact with the internal thread of the blind hole 7. Preferably, however, the shaft can also be formed integrally with the hydraulic cylinder 101.
    The hydraulic piston 101 preferably has, in the area of its lateral surface, a fastening recess 9 arranged between the first and second sealing device 100, 100 ', which is adapted to interact with a tool for connecting the hydraulic piston 101 to the shaft 8. The fastening recess 9 can be used, for example, as a hexagon screw, i. be designed as a counterpart of a hexagonal wrench, so that the hydraulic piston 101 can be screwed onto the shaft 8 by means of such a hexagonal wrench.
    In the region of the second end face 4 'of the hydraulic piston 101, a two-component anti-rotation device 10 is preferably arranged. A sleeve member 10 'of the rotation 10 is connected to the shaft, in particular form-fitting and / or frictionally engaged, for example screwed onto the shaft 8. Alternatively, the sleeve element 10 'can also be fixed to the shaft by means of a grub screw 11.
    The sleeve element 10 'preferably has on its lateral surface an axially extending guide groove 12 into which a pin element 10 "of the anti-twist device 10 engages. In this case, the pin element 10 "preferably projects into the hydraulic cylinder 102. The elongated shape of the guide groove 12 allows movement of the sleeve member 10 'in the axial direction, but reliably prevents rotation of the sleeve member 10', and thus the shaft 8 and connected to the shaft 8 hydraulic piston 101 and / or the small connecting rod, in the circumferential direction.
    FIG. 6 shows a preferred exemplary embodiment of a length-adjustable connecting rod 103, with the connecting rod 103 being in a shortened state with a minimum overall length. The connecting rod 103 preferably has at a lower end a large connecting rod eye 13 for connecting the connecting rod 103 to a crankshaft (not shown). At an upper end, which is opposite to the lower end, the connecting rod 103 preferably has a small connecting rod eye 14, via which the connecting rod 103 by means of a piston pin (not shown) with a piston (not shown) is connectable.
    The small connecting rod eye 14 is preferably connected via a shaft 8 with a hydraulic piston 101, which is arranged axially movable in a hydraulic cylinder 102 of the connecting rod 103. The hydraulic cylinder 102 is preferably closed at an end facing the small connecting rod eye 14 with a stop sleeve 15, which is at least partially screwed into the hydraulic cylinder 102 or can be.
    The stop sleeve 15 forms together with the hydraulic cylinder 102 and a sleeve member 10 'of a rotation 10 preferably a second hydraulic chamber 5' in a region of the small connecting rod 14 facing the second end face 4 'of the hydraulic piston 101. The between the stop sleeve 15, the hydraulic cylinder 102 and the sleeve element 10 'spanned volume is preferably with a hydraulic medium, in particular oil, chargeable. If the connecting rod 103 is not in a shortened state with a minimum total length and the hydraulic medium in the second hydraulic chamber 4 'is subjected to a pressure which is greater than a pressure in a first hydraulic chamber 5, which of the hydraulic piston 101 and the hydraulic cylinder 102 in The hydraulic piston 101 moves axially in the direction of the large connecting rod eye 13. The volume spanned by the first hydraulic chamber 5 is due to the shortened state of the connecting rod 103 with a minimum overall length not visible in the example shown.
    On the other hand, preferably the first hydraulic camera 5 can also be charged with the hydraulic medium, so that the hydraulic piston 101 moves in the direction of the small connecting-rod eye 14 if the pressure prevailing in the first hydraulic chamber is greater than the pressure of the hydraulic medium in the second hydraulic chamber 5 'and the connecting rod 103 is not in an extended state with maximum total length.
    So that a pressurization of the hydraulic medium in the first or second hydraulic chamber 5, 5 'reliably results in a corresponding movement of the hydraulic piston 101, the hydraulic piston 101 preferably has a first sealing device 100 arranged in the region of the first end face 4 of the hydraulic piston 101 and one in the region of the second Front side 4 'of the hydraulic piston 101 arranged second sealing device 100' on. The sealing devices 100, 100 'preferably prevent or at least reduce leakage of the hydraulic medium from the first and / or second hydraulic chambers 5, 5', so that a predetermined pressure for controlling the position in the first and / or second hydraulic chamber 5, 5 ' of the hydraulic piston 101 in the axial direction and thus the total length of the length-adjustable connecting rod 103 can build.
    1-3 first, second, third sealing means I '-3' first, second, third gap o1 upper side of the first sealing device 2u lower side of the second sealing device o3 upper side of the third sealing device 3u underside of the third sealing device 4, 4 'first, second end side 5 , 5 'first, second hydraulic chamber 6, 6' first, second groove 7 blind hole 8 shaft 9 mounting exception 10 anti-rotation 10 'sleeve member 10' 'pin element II grub screw 12 guide groove 13 large connecting rod eye 14 small connecting rod eye 15 stop sleeve 16 fuse element 16a, 16b first, second Retaining lug 16c locking pin 16d securing ball 17a, 17b first, second groove of the first and second sealing device 18 locking pin bore 100, 100 'first, second sealing device 101 hydraulic piston 102 hydraulic cylinder 103 length-adjustable connecting rod
    权利要求:
    Claims (22)
    [1]
    A sealing device (100) for sealing hydraulic chambers (5, 5 ') of a length-adjustable connecting rod (103), in particular an internal combustion engine, comprising: - a first annular sealing device (1) having a first gap (1'); a second annular sealing device (2) with a second gap (2 '); a third annular sealing means (3) having a third gap (3 '), said first and second sealing means (1,2) radially seated on said third sealing means (3) such that said first sealing means (1) and said second sealing device (2) arranged in an axial direction next to each other and the first gap (1 '), the second gap (2') and the third gap (3 ') in a circumferential direction in each case against each other, characterized in that a securing element ( 16) is provided, which is adapted to fix the sealing means (1, 2,3) in the circumferential direction relative to each other.
    A sealing device (100) for sealing hydraulic chambers (5, 5 ') of a length-adjustable connecting rod (103), in particular an internal combustion engine, comprising: - a first annular sealing device (1) having a first gap (1'); a second annular sealing device (2) with a second gap (2 '); a third annular sealing means (3) having a third gap (3 '), said first and second sealing means (1,2) radially seated on said third sealing means (3) such that said first sealing means (1) and said second seal means (2) arranged side by side in an axial direction and the first gap (1 '), the second gap (2') and the third gap (3 ') are respectively displaced from each other in a circumferential direction.
    [2]
    2. A sealing device (100) according to claim 1, wherein the securing element (16) has a first on the first sealing means (1) arranged retaining lug (16 a) and a second on the second sealing means (2) arranged retaining lug (16 b), and wherein the first and second retaining lugs (16a, 16b) are each adapted to engage in the third gap (3 ').
    Second sealing device (100) according to claim 1 with a securing element (16) which is adapted to fix the sealing means (1,2,3) in the circumferential direction relative to each other.
    [3]
    3. A sealing device (100) according to claim 1 or 2, wherein the first sealing means (1) has a first groove (17a) and the second sealing means (2) has a second groove (17b) and the securing element (16) to parts in the first Groove (17a), the second groove (17b) and the third gap (3 ') or a bore of the third sealing device is arranged.
    3. A sealing device (100) according to claim 2, wherein the securing element (16) has a first on the first sealing means (1) arranged retaining lug (16 a) and a second on the second sealing means (2) arranged retaining lug (16 b), and wherein the first and second retaining lugs (16a, 16b) are each adapted to engage in the third gap (3 ').
    [4]
    4. Sealing device (100) according to claim 3, wherein the securing element (16) has a securing pin (16c) which passes through the third gap (3 ') or the bore of the third sealing device (3') into the first and second grooves (16). 17a, 17b) and in a locking pin bore (18) of a hydraulic piston (101) is insertable.
    4. Sealing device (100) according to claim 2, wherein the first sealing device (1) has a first groove (17a) and the second sealing device (2) has a second groove (17b) and the securing element (16) to parts in the first groove (17). 17a), the second groove (17b) and the third gap (3 ') or a bore of the third sealing device is arranged.
    [5]
    5. Sealing device (100) according to claim 3, wherein the securing element (16) has a safety ball (16d) which in the third gap (3 ') and in the first and second groove rests (17a, 17b).
    5. Sealing device (100) according to claim 4, wherein the securing element (16) has a securing pin (16c) which passes through the third gap (3 ') or the bore of the third sealing device (3') into the first and second grooves (16). 17a, 17b) and in a locking pin bore (18) of a hydraulic piston (101) is insertable.
    [6]
    6. Sealing device (100) according to any one of the preceding claims, wherein the total axial height of the first and second sealing means (1, 2) in a seated state on the third sealing means (3) at least substantially corresponds to the axial height of the third sealing means (3) ,
    6. Sealing device (100) according to claim 4, wherein the securing element (16) has a safety ball (16d) which in the third gap (3 ') and in the first and second groove rests (17a, 17b).
    [7]
    7. A sealing device (100) according to claim 6, wherein the total axial height of the first and second sealing means (1, 2) and the axial height of the third sealing means (3) between 0.75 mm and 5 mm, preferably between 1 mm and 2 mm , in particular between 1.25 mm and 1.75 mm.
    7. Sealing device (100) according to one of the preceding claims, wherein the total axial height of the first and second sealing means (1, 2) in a seated state on the third sealing means (3) at least substantially corresponds to the axial height of the third sealing means (3) ,
    [8]
    8. Sealing device (100) according to any one of the preceding claims, wherein an outer diameter of the first and second sealing means (1, 2) each between 15 mm and 25 mm, preferably between 17.5 mm and 22.5 mm, in particular between 19 mm and 21 mm.
    8. Sealing device (100) according to claim 7, wherein the total axial height of the first and second sealing means (1, 2) and the axial height of the third sealing means (3) between 0.75 mm and 5 mm, preferably between 1 mm and 2 mm , in particular between 1.25 mm and 1.75 mm.
    [9]
    9. Sealing device (100) according to any one of the preceding claims, wherein an inner diameter of the first and second sealing means (1, 2) on the one hand and an outer diameter of the third sealing means (3) on the other hand in each case between 14 mm and 24 mm, preferably between 16 mm and 22 mm, in particular between 18 mm and 20 mm.
    9. Sealing device (100) according to any one of the preceding claims, wherein an outer diameter of the first and second sealing means (1, 2) each between 15 mm and 25 mm, preferably between 17.5 mm and 22.5 mm, in particular between 19 mm and 21 mm.
    [10]
    10. Sealing device (100) according to any one of the preceding claims, wherein an inner diameter of the third sealing means (3) between 13 mm and 23 mm, preferably between 15 mm and 21 mm, in particular between 17 mm and 19 mm.
    10. Sealing device (100) according to any one of the preceding claims, wherein an inner diameter of the first and second sealing means (1, 2) on the one hand and an outer diameter of the third sealing means (3) on the other hand between 14 mm and 24 mm, preferably between 16 mm and 22nd mm, in particular between 18 mm and 20 mm.
    [11]
    11. Sealing device (100) according to one of the preceding claims, wherein the first, second and third sealing means (1-3) are each made of spring steel.
    11. Sealing device (100) according to any one of the preceding claims, wherein an inner diameter of the third sealing means (3) between 13 mm and 23 mm, preferably between 15 mm and 21 mm, in particular between 17 mm and 19 mm.
    [12]
    12. Sealing device (100) according to one of the preceding claims, wherein the first and the second gap (1 ', 2') are displaced in the circumferential direction by substantially 180 degrees to each other.
    12. Sealing device (100) according to one of the preceding claims, wherein the first, second and third sealing means (1-3) are each made of spring steel.
    [13]
    13. Sealing device (100) according to one of the preceding claims, wherein a gap width of the first, second and third gap (1'-3 ') in the seated state of the first and second sealing means (1, 2) on the third sealing means (3) lower is greater than 75 pm, preferably less than 50 pm, in particular less than 10 pm.
    13. Sealing device (100) according to one of the preceding claims, wherein the first and the second gap (1 ', 2') are displaced in the circumferential direction by substantially 180 degrees to each other.
    [14]
    14. Hydraulic piston (101), in particular replaceable piston, with at least one sealing device (100) according to one of claims 1 to 13.
    14. Sealing device (100) according to any one of the preceding claims, wherein a gap width of the first, second and third gap (1'-3 ') in the seated state of the first and second sealing means (1, 2) on the third sealing means (3) lower is greater than 75 pm, preferably less than 50 pm, in particular less than 10 pm.
    [15]
    15. hydraulic piston (101), in particular according to claim 14, wherein a first sealing device (100) in a region of a first end face (4) of the hydraulic piston (101) and a second sealing device (100 ') in a region of the first end face (4 ) opposite, second end face (4 ') of the hydraulic piston (101) is arranged.
    15. Hydraulic piston (101), in particular replaceable piston, with at least one sealing device (100) according to one of claims 1 to 14.
    [16]
    16. hydraulic piston (101) according to claim 15 with a lateral surface, which is axially bounded by the first end face (4) and the second end face (4 '), wherein the lateral surface in the region of the first end face (4) a first, the lateral surface encircling Groove (6) for receiving the first sealing device (100) and in the region of the second end face (4 ') has a second, circumferential surface groove (6') for receiving the second sealing device (100 ').
    16. hydraulic piston (101), in particular according to claim 15, wherein a first sealing device (100) in a region of a first end face (4) of the hydraulic piston (101) and a second sealing device (100 ') in a region of the first end face (4 ) opposite, second end face (4 ') of the hydraulic piston (101) is arranged.
    [17]
    17. Hydraulic piston (101) according to one of claims 14 to 16 with an axially arranged blind hole (7), wherein the hydraulic piston (101) by means of the blind hole (7) with a shaft (8), in particular a length-adjustable connecting rod (103), connectable is.
    17. hydraulic piston (101) according to claim 16 with a lateral surface which is axially bounded by the first end face (4) and the second end face (4 '), wherein the lateral surface in the region of the first end face (4) a first, the lateral surface circumferential Groove (6) for receiving the first sealing device (100) and in the region of the second end face (4 ') has a second, circumferential surface groove (6') for receiving the second sealing device (100 ').
    [18]
    18. hydraulic piston (101) according to claim 17 having at least one mounting recess (9) which on the or a lateral surface of the hydraulic piston (101) is arranged and adapted or formed with a tool for connecting the hydraulic piston (101) with the Shank (8) interact.
    18. Hydraulic piston (101) according to one of claims 15 to 17 with an axially arranged blind hole (7), wherein the hydraulic piston (101) by means of the blind hole (7) with a shaft (8), in particular a length-adjustable connecting rod (103). , is connectable.
    [19]
    A length adjustable connecting rod (103) for use in a variable compression ratio internal combustion engine, comprising a hydraulic cylinder (102) and a hydraulic piston (101) according to any one of claims 14 to 18.
    19. hydraulic piston (101) according to claim 18 having at least one fastening recess (9) which on the or a lateral surface of the hydraulic piston (101) is arranged and adapted or formed, with a tool for connecting the hydraulic piston (101) with the Shank (8) interact.
    [20]
    A connecting rod (103) according to claim 19, including an anti-rotation device (10) adapted to fix a shaft (8) of the connecting rod (103) in a circumferential direction relative to the hydraulic cylinder (102).
    A length adjustable connecting rod (103) for use in a variable compression ratio internal combustion engine, comprising a hydraulic cylinder (102) and a hydraulic piston (101) according to any one of claims 10 to 15.
    [21]
    21 connecting rod (103), in particular according to claim 20, wherein the anti-rotation device (10) in the hydraulic cylinder (102) movable in the axial direction, with the shaft (8) connected to the sleeve member (10 ') and a radially into the hydraulic cylinder (102). protruding pin member (10 ") which engages in a on a shell side of the sleeve member (10 ') arranged in the axial direction guide groove (12) of the sleeve member (10').
    21. connecting rod (103) according to claim 20 with a rotation (10) which is adapted to a shaft (8) of the connecting rod (103) in a circumferential direction relative to the hydraulic cylinder (102) to fix.
    22 connecting rod (103), in particular according to claim 21, wherein the anti-rotation device (10) in the hydraulic cylinder (102) movable in the axial direction, with the shaft (8) connected to the sleeve member (10 ') and a radially into the hydraulic cylinder (102). protruding pin member (10 ") which engages in a on a shell side of the sleeve member (10 ') arranged in the axial direction guide groove (12) of the sleeve member (10').
    23. A manufacturing method of a sealing device (100, 100 ') according to any one of claims 1 to 14, wherein the first and second sealing means (1, 2) are mounted on the third sealing means (3) in such a manner that the first sealing means (1 ) is arranged axially next to the second sealing device (2) and both an upper side (o1) of the first sealing device (1) together with an upper side (o3) of the third sealing device (3) and a lower side (2u) of the second sealing device (2) is ground flat together with a bottom surface (3u) of the third sealing device (3).







    claims
    [22]
    22. A manufacturing method of a sealing device (100, 100 ') according to any one of claims 1 to 13, wherein the first and second sealing means (1, 2) are mounted on the third sealing means (3) in such a manner that the first sealing means (1 ) is arranged axially next to the second sealing device (2) and both an upper side (o1) of the first sealing device (1) together with an upper side (o3) of the third sealing device (3) and a lower side (2u) of the second sealing device (2) is ground flat together with a bottom surface (3u) of the third sealing device (3).
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    同族专利:
    公开号 | 公开日
    DE102018205184A1|2018-10-11|
    AT519652B1|2018-09-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0351976A2|1988-07-16|1990-01-24|Jaguar Cars Limited|Pistons|
    DE68925113T2|1988-10-31|1996-05-09|Toshiba Kawasaki Kk|SEALING DEVICE|
    FR2677100A1|1991-05-30|1992-12-04|Plas Gerard|Annular sealing device for a piston with reciprocating movement running in a cylinder, for heat engine, but not exclusively|
    WO2016203047A1|2015-06-18|2016-12-22|Avl List Gmbh|Longitudinally adjustable connecting rod|
    AT521501B1|2018-12-03|2020-02-15|Avl List Gmbh|Length-adjustable connecting rod with press connection|
    AT522985B1|2019-10-08|2021-07-15|Avl List Gmbh|Length-adjustable connecting rod with a sealing device|
    法律状态:
    2019-07-15| PC| Change of the owner|Owner name: AVL LIST GMBH, AT Effective date: 20190515 Owner name: IWIS MOTORSYSTEME GMBH & CO. KG, DE Effective date: 20190515 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50288/2017A|AT519652B1|2017-04-07|2017-04-07|Sealing device and hydraulic piston with sealing device|ATA50288/2017A| AT519652B1|2017-04-07|2017-04-07|Sealing device and hydraulic piston with sealing device|
    DE102018205184.4A| DE102018205184A1|2017-04-07|2018-04-06|Sealing device and hydraulic piston with sealing device|
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